JPS6052909A - Vertical magnetic recording head - Google Patents

Abstract

PURPOSE:To decrease the space between the record/reproduction and erasion head magnetic poles and to reduce the reduction of the effective track width in the diameter direction, by setting a record/reproduction coil and an erasion coil close to and distance away from a magnetic recording medium respectively. CONSTITUTION:A vertical magnetic recording head is provided with a record/ reproduction head 10, an erasion head 20, a main magnetic pole 11 of an R/W head 10, a magnetic pole 15 of the head 20, a support substrate 12, a soft magnetic substance 14 obtained by replacing a part of the substrate 12, a winding groove 17 for R/W, a record/reproduction coil 13 and an erasion coil 16. The coils 13 and 16 are set on different levels of stages and therefore the space between poles 11 and 15 is reduced. This reduces the decrease of the effective track width in the diameter direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a perpendicular magnetic recording head comprising a recording/reproducing head and an erasing head. 2. Description of the Related Art Information devices such as computers, office computers, word processors, etc. are becoming more and more popular, and their functions are becoming more and more advanced, leading to the development of an information society. Among these, there is a strong demand for systems that record, store, and retrieve large amounts of data, and a compact high-density auxiliary storage device with a large amount of space is in demand. As a high-density recording device like this, a new perpendicular magnetization method, which creates residual magnetization in the thickness direction of the recording medium to thicken and reproduce signals, has attracted attention and is now being put into practical use. research is being conducted.

As a perpendicular magnetization recording medium, a high magnetic permeability layer such as permalloy is formed as the first layer by spacing or vapor deposition on a plastic film with good surface properties and little unevenness.
A recording medium with a two-layer structure in which a perpendicularly magnetized film such as a cobalt-chromium alloy is deposited on the second layer, a medium with a single-layer structure consisting of only a cobalt-chromium perpendicularly magnetized film, or a medium used in conventional in-plane magnetic recording. There are coating-type vertical media coated with fine barium ferrite powder using coating technology.

There are two types of perpendicular magnetic recording heads: an auxiliary pole excitation type and a main pole dynamic type. As shown in FIG. 1(A), the auxiliary magnetic pole excitation type head holds a recording medium 1 between two support substrates 3, and a high permeability magnetic film 2 made of Nihermalloy, cobalt, amorphous zirconium, or the like is held between two supporting substrates 3. The main magnetic pole,
On the other hand, a recording/reproducing coil 5 is attached to a soft magnetic material 4 such as ferrite, and a recording/reproducing coil 5 is attached around the soft magnetic material 4. This main pole excitation type head has a high permeability magnetic film 2 and a coil 5 integrated, so that recording and reproduction can be performed from both sides of the recording medium 1.
This is more practical than the auxiliary magnetic pole excitation type.

By the way, when applying the perpendicular magnetization recording method to a floppy disk, an erasing head must be incorporated together with a recording/reproducing head (hereinafter referred to as an R/W head). In other words, in order to maintain compatibility between devices and media, and to compensate for the expansion and contraction of media and mechanical parts due to misalignment of the rotational axis of the drive or media chucking, or changes in temperature and humidity, erase bands are placed between tracks where signals are recorded. It is necessary to provide In a floppy disk without a track servo mechanism, it is necessary to prevent shadows 11 from adjacent tracks.

Fig. 2 shows a conventional example 4 in which an erase head is completely incorporated into a main pole excitation type head. In the figure, 10 is a recording/reproducing head (hereinafter referred to as R/W head), 20 is an erase head part, and both are integrally connected to each other. has been done. 11 is a main magnetic pole for recording and reproducing, and 16 is a magnetic pole for erasing, each of which is made of a high magnetic permeability magnetic film, and is sandwiched between supporting substrates 12. 13 is a recording/reproducing coil, and 16 is an erasing coil, each of which is wound in a coil groove. 14iIi It is a soft magnetic material such as ferrite that replaced a part of the supporting substrate, and is in contact with the main magnetic pole 11 for recording/reproducing and the magnetic pole 15 for erasing in part.

Next, the operation of the erase head built-in head will be explained in the third step.
This will be explained using figures. First, a signal is written to the area 21 of the track width Ty+ of the main magnetic pole 11 of the recording/reproducing head 1o, and then the signal is written to the area 21 of the track width Ty+ of the main magnetic pole 11 of the recording/reproducing head 1o, and then to the erase area 2 corresponding to the magnetic pole 16 of the erasing head 20.
2, the overlap portion d is erased, and as a result, the remaining track width to be erased becomes TW2. In the case of a device that moves linearly with respect to the head, such as a tape cartridge, the overlap portion tJ, d is is a constant value, but in a device that moves circularly like a floppy disk, there are
The relationship between this quantity, which is a quantity that depends on the gap e between 5 and 5, will be explained with reference to FIG. FIG. 4(A) shows the case where the gap e between the recording/reproducing magnetic pole 11 and the erasing magnetic pole 15 is small, and FIG. 4(B) shows the case when n is large. As shown in this figure, as I becomes larger, the effective 1-rack width TW2 after erasing becomes smaller than the erase magnetic pole gap Two.Also, considering the radius r in track size from the center of rotation of the medium, The amount of decrease in track width is approximately 42/2r. Therefore, the effective track width decreases more on the inner circumferential side of the medium than on the outer circumferential side of the medium, and this tendency becomes more pronounced as the gap 4 between the recording/reproducing main magnetic pole 11 and the erasing magnetic pole 15 becomes larger.

From this, in order to reduce the decrease in track width, it is necessary to reduce the gap 1'c. Gap 4 becomes important, especially in the case of devices with high track density or floppy disks with small media diameter, but in the conventional example shown in Fig. 2,
The gap 4 is between the coil 13 of the R/W head 10 and the erase head 2.
Since the position of the coil 16 of 0 is on the same plane, it has a drawback that it cannot be approached below the coil winding thickness.

Purpose of the Invention The present invention solves the above-mentioned drawbacks by reducing the gap between the recording/reproducing throat magnetic pole and the erasing head magnetic pole, thereby minimizing the decrease in the effective trunk width that contributes to the reproduction output due to track movement. A perpendicular magnetic recording head of the present invention has a recording/reproducing section comprising at least a first high permeability magnetic film and a recording/reproducing coil. and,
A magnetic film comprising at least a second high permeability magnetic film and an erasing coil, and provided adjacent to the recording/reproducing section) τ1
1, the recording/reproducing coil is provided close to the magnetic recording medium, the erasing coil is provided apart from the magnetic recording medium, and the recording/reproducing coil and the erasing coil are arranged in a direction away from the magnetic recording medium. , are arranged so that at least some of them overlap.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. It is a perspective view of a mold head.

In the figure, 10 is a writeable head, 2o is an erase head, 11 is a main magnetic pole of the R/W head 10, and 16 is a magnetic pole of the erase head 20, all of which are made of permalloy, cobalt, etc.
It is made of a high permeability magnetic film such as amorphous zirconium. Reference numeral 12 denotes a support substrate that sandwiches the main magnetic pole 11 and the magnetic pole 15 made of the above-mentioned high magnetic permeability magnetic film, and 14 is a portion in which a part of the support substrate 12 is replaced with a soft magnetic material such as ferrite. 17 is the winding lil for R/W, 7.13
1 is a recording/reproducing coil, and 16 is an erasing coil.

According to this embodiment, the recording/reproducing coil 13 and the erasing coil 1
The position of 6 is not in a positional relationship where each other is back to back,
Since they are configured at different levels from each other, the gap between the main magnetic pole 11 and the magnetic pole 16 can be made close to each other without being limited by the winding thickness of the erasing coil 16. This has the advantage that the decrease in the effective track width TW2 in the radial direction, which inevitably occurs in a circularly moving magnetic recording device such as a floppy disk, can be reduced by bringing the recording/reproducing coil 13 and the erasing coil 16 closer together. have

Incidentally, in order to increase the recording and reproducing efficiency of the main pole excitation type head, it is difficult to make the distance between the magnetic medium (not shown) and the recording and reproducing coil 13 closer.

On the other hand, if the erasing coil 16 is separated from the magnetic medium, the erasing efficiency will be completely reduced, but this is not an essential drawback since the full reproduction function of the R/W head is not required.

FIG. 6 shows a second embodiment of the invention.

In this embodiment, a groove 1 for accommodating the erasing coil 16 is formed in a part of the supporting substrate 12 of the R/W head 10 that is in contact with the erasing head 20.
8 is provided so that the gap between the main magnetic pole 11 and the erase magnetic pole 15 can be made small. In the case of this embodiment as well, it is possible to construct a perpendicular magnetic head incorporating an erase head having the same effects as in the first embodiment.

Effects of the Invention In short, the present invention comprises a recording/reproducing section consisting of at least a first high permeability magnetic film and a recording/reproducing coil, and at least a second high permeability magnetic film and an erasing coil. an erasing unit provided adjacent to the recording/reproducing coil, the recording/reproducing coil is close to a magnetic recording medium, the erasing coil is provided apart from the magnetic recording medium, and the recording/reproducing coil and the erasing coil are connected to each other. , which are arranged so that at least a part of them overlaps in the direction away from the magnetic recording medium, and according to the present invention, they are not limited by the winding thickness of the erase coil (the gap between the R/W magnetic pole and the erase magnetic pole is brought closer to each other). Therefore, even in a rotating magnetic recording device such as a floppy disk, the reduction in effective track width in the radial direction caused by the gap between the R/W magnetic pole and the erase magnetic pole can be reduced.

[Brief explanation of drawings]

Figures 1 (A) and (B) are general views showing the configuration of a conventional perpendicular magnetic recording head, Figure 2 is a perspective view of a conventional main pole excitation type head incorporating an erase head, and Figures 3 and 4. Figures (A) and (B) are schematic diagrams showing the positional relationship between write tracks and erase tracks, and Figures 5 and 6 are perspective views of a perpendicular magnetic recording head in another embodiment of the present invention. 10...Recording/reproducing head, 11...Recording/reproducing magnetic pole, 12...Nonmagnetic support substrate, 13...
Koinope for recording and reproduction 14...High magnetic permeability material, 15.
... Erasing magnetic pole, 16 - Erasing coil, 20...
・Name of head agent Keno Toshi Nakao and one other person Figure 1-2 Figure I? Figure 3 Figure 4 (c) (F3) ↑ TW. ★- Na TV. ψ

Claims (1)

[Claims] a recording/reproducing section having at least a first high magnetic permeability magnetic film and a recording/reproducing coil; an erasing section having at least a second high magnetic permeability magnetic film and an erasing coil; and an erasing section provided adjacent to the recording/reproducing section. The recording/reproducing coil is provided close to the magnetic recording medium, the erasing coil is provided apart from the magnetic recording medium, and the recording/reproducing coil and the erasing coil are arranged in a direction away from the magnetic recording medium. , a perpendicular magnetic recording head characterized in that the heads are arranged such that at least a portion thereof overlaps with each other.